def test_consume_two_letter(self):
s = TextScanner("word")
s.consume(2)
assert s.peek() == "r"
def test_scan_empty_text(self):
s = TextScanner("")
assert s.is_empty is True
assert s.has_data is False
assert s.peek() == "" # empty string signals end of text
assert s.get() == ""
def test_consume_one_letter(self):
s = TextScanner("word")
s.consume()
assert s.peek() == "o"
def test_getting_next_letter_forwards_scan_position(self):
s = TextScanner("word")
assert s.get() == "w"
assert s.peek() == "o"
def test_peeking_beyond_word_boundaries_returns_empty_string(self):
s = TextScanner("word")
assert s.peek(4) == ""
def test_peeking_more_letters_ahead(self):
s = TextScanner("word")
assert s.peek(1) == "o"
assert s.peek(2) == "r"
def test_peeking_next_letter(self):
s = TextScanner("word")
assert s.peek() == "w"
